Skip - prefix variable names when saving. (Ephemeral variables)

[Moderocky]

Description

Variables starting with - will be skipped during saving.
There is no longer a warning about using -, since this is now the default behaviour.

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Target Minecraft Versions: any
Requirements: none
Related Issues: #6454

[UnderscoreTud]

is there a way to add tests for this using JUnit?

[UnderscoreTud]

is the label for this loop still needed?

[Moderocky]

Probably not.

[ShaneBeee]

This PR confuses me for a couple reasons:

1. If its now default to allow a hyphen in variables, why not remove it from the list of reserved tokens rather than checking for it and allowing bypass?
   (From the Variable class)

2. In general it really confused me why SkriptLang decided this is an illegal token considering this has been the suggested method in the config since forever (Ive been using Skript for 7+ years and its always been there) and is still in the config as the suggested token for "memory variables".
   Maybe this should be made the default?
   (This has been suggested for YEARS, even tho a few (or one) team members were against it)
   From the default config (potentially added about 10 years ago, based on last commit):

[sovdeeth]

2. In general it really confused me why SkriptLang decided this is an illegal token considering this has been the suggested method in the config since forever (Ive been using Skript for 7+ years and its always been there) and is still in the config as the suggested token for "memory variables".
   Maybe this should be made the default?
   (This has been suggested for YEARS, even tho a few (or one) team members were against it)
   From the default config (potentially added about 10 years ago, based on last commit):

It was never an illegal token, it was reserved specifically in order to make it an official memory variable prefix, which is what this PR is doing.

[sovdeeth]

Actually, on second thought, shouldn't we catch this earlier in the process, like at saveVariableChange? Then it won't even be added to the save queue or serialized.

[ShaneBeee]

It was never an illegal token, it was reserved specifically in order to make it an official memory variable prefix, which is what this PR is doing.

OHHHHH... ok I totally misread the PR then. The description was a bit vague and I didn't really know what it was doing. I see it now, thank you for the clarification.